Guangxi Zhiwu (Feb 2023)
Comparative study of flora from central mountainous area to eastern coastal area of Hainan
Abstract
The terrain of Hainan Island is high in the middle and surrounded by low terrain on all sides. From the central mountainous area to the eastern coastal plains, due to the difference of natural conditions and historical human interference, the composition of flora has changed. In this study, quadrant and line transect survey was carried out in Huishan Nature Reserve (in the middle and east of Hainan Island) to discover its composition. Then combined with the data of Wuzhishan Nature Reserve in the middle of Hainan Island (now part of the Tropical Rainforest National Park), Baishiling Nature Reserve in the eastern non-coastal area and Tongguling Nature Reserve in the northeastern coast, which investigated by our team, the flora composition characteristics were compared and analyzed. Try to explore the relationship between the change of flora composition and the secondary, area and altitude of the nature reserve. The results were as follows: (1) There were 1 893 species, 1 415 species, 634 species, and 913 wild seed plants in Wuzhishan, Huishan, Baishiling, and Tongguling nature reserves, the numbers of species in the two central nature reserves were significantly higher than that in the other two nature reserves. (2)Species similarities between nature reserves were significantly negatively correlated with differences in altitude and area (P<0.05). (3) Four nature reserves were dominated by tropical elements, but at the level of genera, Wuzhishan was dominated by tropical Asia, while others were dominated by pantropical distribution; at the level of species, distribution of tropical Asia was the most in the four nature reserves. In conclusion, from the central mountainous area to the eastern coastal plains, the more secondary, the lower the altitude, the fewer the habitat types, and the fewer the number of plant species; at the same time, at the level of genera and species, the tropical elements are increased, while temperate, endemic and relict elements are decreased.
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